#include "muduo/proto/codec.h"
#include "muduo/proto/dispatcher.h"
#include "request.pb.h"
#include "muduo/base/Logging.h"
#include "muduo/base/Mutex.h"
#include "muduo/net/EventLoop.h"
#include "muduo/net/TcpServer.h"

#include<iostream>
#include<unordered_map>

class Server
{
public:
    typedef std::shared_ptr<google::protobuf::Message> MessagePtr;
    //protobuf的四个智能指针 自己定义
    typedef std::shared_ptr<xiang11::TranslateRequest> TranslateRequestPtr;
    typedef std::shared_ptr<xiang11::AddRequest> AddRequestPtr;
    Server(int port)
        :_server(&_baseloop, muduo::net::InetAddress("0.0.0.0", port), "Server",
         muduo::net::TcpServer::kReusePort)
        ,_dispatcher(std::bind(&Server::onUnknownMessage,
         this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3))
        ,_codec(std::bind(&ProtobufDispatcher::onProtobufMessage, &_dispatcher, 
         std::placeholders::_1, std::placeholders::_2, std::placeholders::_3))
    {
        //注册业务请求处理函数 
        _dispatcher.registerMessageCallback<xiang11::TranslateRequest>(std::bind(&Server::onTranslate, this,
        std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));

        _dispatcher.registerMessageCallback<xiang11::AddRequest>(std::bind(&Server::onAdd, this,
        std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));

        _server.setMessageCallback(std::bind(&ProtobufCodec::onMessage, &_codec,
        std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));

        _server.setConnectionCallback(std::bind(&Server::onConnection, this,
        std::placeholders::_1));

    }

    void start()
    {
        _server.start();    //开始监听
        _baseloop.loop();   //开始事件监控， 这是一个死循环接口
    }

private:
    //两个业务处理函数
    void onTranslate(const muduo::net::TcpConnectionPtr &conn, const TranslateRequestPtr &message, muduo::Timestamp)
    {
        //1. 提取message中的有效消息， 也就是需要翻译的内容
        std::string req_msg = message->msg();
        //2. 进行翻译 得到结果
        std::string rsp_msg = translate(req_msg);
        //3. 组织protobuf的响应
        xiang11::TranslateResponse resp;
        resp.set_msg(rsp_msg);
        //4. 发送响应   _codec序列化
        _codec.send(conn, resp);

    }
    void onAdd(const muduo::net::TcpConnectionPtr &conn, const AddRequestPtr &message, muduo::Timestamp)
    {
        int num1 = message->num1();
        int num2 = message->num2();
        int result = num1 + num2;
        xiang11::AddResponse resp;
        resp.set_result(result);
        _codec.send(conn, resp);
    }
    
    std::string translate(std::string &str)
    {
        static std::unordered_map<std::string, std::string> dict_map = 
        {
            {"hello", "您好"},
            {"hello", "您好"},
            {"你好", "hello"},
            {"您好", "Hello"}
        };
        auto it = dict_map.find(str);    
        if(it == dict_map.end())
        {
            return "没听懂";
        }
        else
        {
            return it->second;
        }

    }
    void onConnection(const muduo::net::TcpConnectionPtr &conn)
    {
        if(conn->connected())
        {
            LOG_INFO << "新链接建立成功";
        }
        else
        {
            LOG_INFO << "链接关闭";
        }
    }
    void onUnknownMessage(const muduo::net::TcpConnectionPtr &conn, const MessagePtr &message, muduo::Timestamp)
    {
        LOG_INFO << "onUnknownMessage: " << message->GetTypeName();
        conn->shutdown();
    }

private:
    muduo::net::EventLoop _baseloop;
    muduo::net::TcpServer _server;      //服务器对象
    ProtobufDispatcher _dispatcher;     //请求分发器对象 -- 要向其中注册请求处理函数
    ProtobufCodec _codec;               //protobuf协议处理器 --针对收到的请求数据进行protobuf协议处理器
};


int main()
{
    Server server(8899);
    server.start();
    return 0;
}